Effective ion temperatures in a quadrupole ion trap

Nourse, B. D.; Kenttämaa, Hilkka I.

doi:10.1021/j100378a038

Cited by 41 publications

(30 citation statements)

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“…In early work, the kinetics of the reaction of CH 4 with O 2 þ was used to probe the effective temperature of ions in a quadrupole ion trap (Nourse & Kenttamaa, 1990;Basic, Eyler, & Yost, 1992). This system had been studied in the past under a wide range of conditions so a correlation between reaction rate and ion energy was already well established.…”

Section: B Temperaturementioning

confidence: 99%

“…This system had been studied in the past under a wide range of conditions so a correlation between reaction rate and ion energy was already well established. Some of the data obtained in the ion trap suggested an effective ion temperature of nearly 600 K (Nourse & Kenttamaa, 1990); however, the chemical system as well as the data analysis proved to be problematic. In a later experiment, an equilibrium constant for adduct formation, rather than a rate, was used for estimating the effective temperature in a quadrupole ion trap (Gronert, 1998).…”

Section: B Temperaturementioning

confidence: 99%

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Quadrupole ion trap studies of fundamental organic reactions

Gronert

2004

Mass Spectrometry Reviews

128

133

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Over the past several decades, quadrupole ion traps have become important instruments in the study of gas phase ion/molecule reactions. As a part of this work, they have been employed in a number of studies focused on fundamental organic reaction mechanisms. In this review, the general features and limitations of quadrupole ion traps are discussed followed by a description of representative ion trap studies of organic reaction mechanisms such as substitution, elimination, and acyl transfer reactions.

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Section: B Temperaturementioning

confidence: 99%

Section: B Temperaturementioning

confidence: 99%

Quadrupole ion trap studies of fundamental organic reactions

Gronert

2004

Mass Spectrometry Reviews

128

133

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“…It was therefore chosen to obtain an idea of the energy that the injected ions have in the quistor (compare Ref. 21 for a similar study with 0;' ions generated inside an ion trap). Both the reaction rate constant and the distribution of products are energy dependent.…”

Section: Resultsmentioning

confidence: 99%

A novel quadrupole, quistor, quadrupole tandem mass spectrometer

Kofel¹,

Reinhard²,

Schlunegger³

1991

Org. Mass Spectrom.

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A quadrupole, quistor, quadrupole tandem mass spectrometer allowing selected ion/selected molecule reactions was built. The quistor will be used as a reaction chamber for the study of organic ion-molecule reactions. Ions are generated in a differentially pumped ion source, quadrupole mass selected and injected into the quistor. The ions are trapped in the quistor by the combined action of a deceleration lens, the presence of helium buffer gas and the quistor RF field. As a first test of the performance of the instrument, the reaction rate constant of the reaction of 0;. with methane was measured to be 5 x lo-'' cm3 s -I . This is in good agreement with literature values, indicating that the ions are near thermal equilibrium after a few milliseconds of trapping time.

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“…The ability to sequentially mass-select and store reagent ions of a single mass-to-charge ratio allows MS n analyses [1-4J as well as selected-reagent ion chemical ionization (Cl) [5]. The QITMS has also been used in the study of ionmolecule reaction kinetics [6][7][8][9][10], in proton affinity [11][12][13][14] and relative gas-phase basicity determinations [IS}, and in recent ion structural studies [16,17], As the ion trap becomes increasingly popular in both fundamental and applied mass spectrometric studies, knowledge of the average ion energies under a variety of experimental conditions becomes increasingly important.…”

mentioning

confidence: 99%

Probing trapped ion energies via ion-molecule reaction kinetics: Quadrupole ion trap mass spectrometry

Basic

Eyler

Yost

1992

J. Am. Soc. Mass Spectrom.

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We present a detailed study of the energies of the ions stored in a quadrupole ion trap mass spectrometer (QITMS). Previous studies have shown that the rate constant, k, for the charge exchange reaction Ar(+) N(+) 2 →, N(+) 2+Ar increases with increasing ion-molecule center-of-mass kinetic energy (K.E.cm). Thus, we have determined k for this chemical "thermometer" reaction at a variety of Ar and N2 pressures and have assigned K.E.cm values as a function of the q2 of the Ar(+) ion both with and without He buffer gas present in the trap. The K.E.cm energies are found to lie within the range 0.11-0.34 eV over the variety of experimental conditions investigated. Quantitative "cooling" effects due to the presence of He buffer gas are reported, as are increases in K.E.cm due to an increase in the q2 of the Ar(+) ion. "Effective" temperatures of the Ar(+) ions in He buffer are determined based on a Maxwell-Boltzmann distribution of ion energies. The resulting temperatures are found to lie within the range ≈ 1700-3300 K. We have also examined the K.E.cm, values arising from the chemical thermometer reaction of O(+) 2 with CH4, as previous assignments of effective ion temperatures based on this reaction have been called into question.

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Effective ion temperatures in a quadrupole ion trap

Cited by 41 publications

References 1 publication

Quadrupole ion trap studies of fundamental organic reactions

Quadrupole ion trap studies of fundamental organic reactions

A novel quadrupole, quistor, quadrupole tandem mass spectrometer

Probing trapped ion energies via ion-molecule reaction kinetics: Quadrupole ion trap mass spectrometry

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